Comparison

Gengou Lib vs JHP byNSDev

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Gengou Lib

Quickly convert between Japanese era names and Christian era years. Features include era and year searching, period and era pickers, and the ability to display the current year in either system. Texts can be shown in Japanese or English.

Highlights
  • Era and year search
  • Period picker
  • Era picker
  • Christian era year picker
  • Japanese era year picker
  • Show this year button
  • Multi-language text display
Features
Read full description

"Gengou Lib." is a quick reference of the Japanese era system. This application has functions as below. - Era and Year Search - Period picker - Era picker - Christian era year picker - Japanese era year picker - Show this year button - Texts can be shown in Japanese or English independently of the default language setting. - Application badge can show this year number in the Japanese era or the Christian era. The Japanese era system identifies a year by the combination of the era name (Gengou or Nengou) and the year number within the era. For example, A.D. 2001 is Heisei 13. Please note that two Gengou schemes were used in Parallel from 1331 to 1392 during Nanboku-chō period. This application would be very useful if you are working with the governments, municipal offices and/or certain companies in Japan.

About

JHP byNSDev

Features
Read full description

Software that displays the population of the municipality of Japan (man, woman), the number of households. Currently it is data from 1995 onwards, but we will add it sequentially. *How to use From the year you want to display, all data, number of households, total sex and total, total. *Function The population (male, female, total), you can sort by the number of households. When you select all the municipalities, you can choose to show or hide prefecture names as options. *Data source Portal Site of Official Statistics of Japan website (http://www.e-stat.go.jp/).

Screenshots

Gengou Lib4 screens
JHP byNSDev4 screens

Verdict

The call

The clearest difference is ads: JHP byNSDev at none against Gengou Lib's shown. JHP byNSDev also leads on update cadence (every 7 months vs every 61 months). Gengou Lib's advantage is iOS requirement (13.0 vs 15.6). On price, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Gengou Lib ships an update every 61 months, JHP byNSDev every 7 months. The most recent releases landed on August 13, 2026 and September 16, 2026 respectively.

Scorecard3 real differences · 7 level
Gengou Lib versus JHP byNSDev: the parameters behind the verdict, then further details
ParameterGengou LibJHP byNSDev
PriceFreeFree
Rating2.5 (2 ratings) — better—
Positive reviews84.5% of reviews—
Number of ratings2 — better—
Update frequencyEvery 61 monthsEvery 7 months — better
AdsYesNo — better
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better15.6
Further details — not scored
Size6 MB26 MB
Age rating4+4+
DeveloperMasayuki AkamatsuNIHON SYSTEM DEVELOPER CORPORATION

In-app purchases

None

Gengou Lib

No in-app purchases

None

JHP byNSDev

No in-app purchases

Questions

Is Gengou Lib free?
Gengou Lib is free to download, with no in-app purchases.
Is JHP byNSDev free?
JHP byNSDev is free to download, with no in-app purchases.
Do Gengou Lib or JHP byNSDev have ads?
Gengou Lib shows ads; JHP byNSDev does not.
Which is updated more often, Gengou Lib or JHP byNSDev?
Gengou Lib ships an update every 61 months, and JHP byNSDev every 7 months. Most recently, Gengou Lib was updated on August 13, 2026 and JHP byNSDev on September 16, 2026.

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